We have not yet left the EU.
The EU is a shrinking economy. It was going to drag the UK down with it unless we left.
The uncertainty post-Ref is causing falling £=good for exporters=good for Co.s seeking new markets across the world.
Falling house builder shares will recover because there is a massive house shortage.
Falling property investor shares are good because it will help to burst the mad London/SE property price bubble based on overseas investors who are dead money to the economy (properties kept empty=no money spent).
The EU negotiations should go well for UK because we are in the stronger position because of our trade deficit.
No trade deal doesn't mean no trade. It means tariffs on trade. If eg France imposed tariffs on imports of say cheddar cheese at 3%, then the UK would impose tariffs of 3% on brie. It adds overall to costs (collecting and recording the tariff) but does not stop trade.
Low interest rates will help investment borrowing allowing Co.s seeking new markets to expand and helping to raise productivity which has been a serious UK economy problem.
EU funds to regions will be maintained by UK gov but can be much more tailored to needs than a remote EU bureaucracy could manage.
We can maintain immigration as much as is right for the UK's economy/resources - it's just that we don't have to if it doesn't suit the country's interests.
Current EU nationals in UK/UK nationals in EU should not worry. There will be a reciprocal arrangement because it is too disruptive to every nation's economy to impose constraints.
University collaboration will not cease, a mechanism already exists for collaboration for non-EU institutions that can be extended.
Does that provide any reassurance to the doom mongerers?